Icon for a display screen



FIG. 1 is a top, front, right side perspective view of an icon for a display screen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a front elevational view thereof, the icon is shown separately for clarity of illustration.

The broken line drawing of a display screen in FIGS. 1 and 2 shows the environment on which the icon is displayed and forms no part of the claimed design. 

The ornamental design for an icon for a display screen, as shown and described. 